State water officials continued to lower the level of Lake Oroville on Tuesday in anticipation of a series of storms that were forecast to begin arriving with new rain late Wednesday.
By 7 a.m. Tuesday, Department of Water Resources crews had lowered the reservoir level by at least 11 feet from the point at which it threatened potential disaster this weekend.
The water level at Oroville peaked on Saturday at about 902 feet, which sent water cascading over a concrete weir and into an unlined emergency spillway that had never been used.
On Sunday however, the earthen emergency spillway began to show signs of heavy erosion. Fearing that the damage could undermine the concrete weir that formed the lake’s shore and cause it to fail, and send a wall of water coursing into the Feather River below, officials ordered sweeping evacuations for more than 100,000 people.
Now, according to DWR data, Lake Oroville is at 889 feet and dropping about a foot every three hours, as engineers release water from the lake at about 100,000 cubic feet per second. That water is being released down the reservoir’s main spillway, which has also suffered major damage due to erosion. The main spillway was designed for a peak flow water rate of 150,000 cubic feet per second, but a massive break in the lower portion of the concrete chute has complicated matters.
Live updates from Lake Oroville »
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An aerial view of the water flowing out of the Oroville Dam main spillway, in Oroville, Calif., on Tuesday, February 21, 2017.
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An aerial view of the water flowing out of the Oroville Dam’s main spillway on Feb. 21. (Marcus Yam / Los Angeles Times)
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Reduced water releases at the Oroville Dam have made damage to its main spillway more visible. (Marcus Yam / Los Angeles Times)
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With a reduced flow on Sunday, most of the water being released from the Oroville Dam is not going down the spillway; it has broken through and is flowing down the hillside. (Marcus Yam / Los Angeles Times)
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With a reduced flow on Sunday, most of the water being released from the Oroville Dam is not going down the spillway, it’s broken through and is going down the hillside.
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With a reduced flow on Sunday, most of the water being released from the Oroville Dam is not going down the spillway, it’s broken through and is going down the hillside.
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Juan Alvarez reassures his girlfriend, Sarah Hendrix, after helping her move out of her home in rural Maxwell. Water was a foot high and crews had to evacuate 100 people because of flooding-- some by boat.
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Ron Chambers lets Duke out of his crate for the first time in hours since the flooding began n Maxwell, Calif. on Saturday.
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Kevin Anfinson and other volunteers help shovel the muddy sediment that has built up in the salmon raceway at the Feather River Fish Hatchery in Oroville, Calif. (Marcus Yam / Los Angeles Times)
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Fernando Martinez and his mother, not pictured, wade through a road in Gridley, Calif., flooded by the Feather River as it continues to swell from the water being let out of Lake Oroville.
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A man in a 4x4 truck turns around on Gridley Road after having second thoughts about making it across the flooded road, which had been closed.
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Randy Boheim packs up his tools and emergency supplies in anticipation of having to evacuate his whole family as floodwaters creep closer to his home in an Oroville, Calif., mobile home park. The nearby Feather River continued to swell from the water being let out of Lake Oroville ahead of this weekend’s storm.
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A plantation in Oroville, Calif., sits in floodwaters as the Feather River continues to swell from the water being let out of Lake Oroville ahead of this weekend’s storm.
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Helicopters ferry sand and rocks to the Oroville Dam’s emergency spillway reconstruction project in Oroville, Calif., ahead of coming rains.
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California Water Service district manager Toni Ruggle surveys the Feather River at Bedrock Park downstream from the Oroville Dam.
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McKenna Harvey, 9, left, Kylie Atteberry, 11, and Brooklyn Atteberry, 7, hold signs thanking workers in the repair effort at the Oroville Dam.
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A helicopter flies over as water flows from the main spillway at Lake Oroville. (Marcus Yam / Los Angeles Times)
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Reconstruction continues in a race to shore up the emergency spillway at Oroville Dam. (Brian van der Brug / Los Angeles Times)
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As rain clouds gather, friends from left, Johnny Eroh, Cody Balmer, Kristien Bravo and Jerel Bruhn hang out by the flooded Feather river in the Bedrock neighborhood of Oroville, Calif., last week. (Marcus Yam / Los Angeles Times)
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Evacuees at the Bangor Community Hall in Bangor, Calif., listen to Butte County sheriff’s deputies in February as the mandatory evacuation order was lifted. An evacuation advisory was lifted Wednesday. (Brian van der Brug / Los Angeles Times)
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Evacuees at the Bangor Community Hall get the news from Butte County sheriff’s Deputy Jeff Heath that the evacuation order has been lifted.
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Evacuee Sharon Dalton, right, hugs Raiden Ellis, 10 months, and Chris Ellis as they say their goodbyes as she leaves the Bangor Community Hall in Bangor, Calif., on Tuesday.
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David McGlamery returns to his Oroville home with his belongings after the evacuation order was lifted. The family had to retreat to Chico, where they initially stayed at a Walmart parking lot with other evacuees. (Marcus Yam / Los Angeles Times)
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Bill Tirey helps family members move back into their home in the Bedrock neighborhood of Oroville near the Feather River after evacuation orders were lifted.
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Maria Alancar returns home to greets her pet pig Bacon, who was left behind when the family moved to higher ground in Honcut, Calif.
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Sulet Lopez, 21, left, Melissa Mendoza, 3, and Yeanet Lopez, 18, pack up their car at the Bangor Community Hall in Bangor, Calif., to head home after the evacuation order was lifted.
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Erica Stenholm, left, Ronnie Vaughan, and Brooklyn Jackson, 7, unpack their car upon returning home after the evacuation order had been lifted in Oroville.
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Jonah Avina, left, and his wife, Eileen, pray before lunch at the Maranatha Mennonite Fellowship in Bangor, Calif., on Tuesday. The Bangor-area Mennonites are hosting several immigrant families evacuated from the nearby town of Honcut.
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Evacuee Estafani Reynoso, left, colors with Mennonite children at the Maranatha Mennonite Fellowship in Bangor, Calif.
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Crews work on a damaged section of the emergency spillway at Lake Oroville on Monday. (Josh Edelson / AFP/ Getty Images)
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An Oroville property is flooded on Monday as thousands were under evactuation orders.
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The Marysville cemetery underwater along the Feather River.
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Nirmal Singh, a Sikh priest, conducts a morning prayer ritual as evacuees sleep in the background at the Shri Guru Ravidass, a Sikh temple that has opened its doors for evacuees of the Oroville Dam crisis in Rio Linda, Calif.
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Kamlesh Nahar, far left, talks to fellow evacuees at the Shri Guru Ravidass Temple.
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Maria Lopez reads on her smartphone as she spends a second night in her father’s car in the parking lot of the Bangor Community Hall.
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Sharon Dalton finds a quiet spot under a table as she spends a second night with her dog Cruiser inside the Bangor Community Hall.
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Verna Chadwick and 10-month-old son Raiden Ellis during a second night in the Bangor Community Hall.
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The emergency spillway, left, and the damaged main spillway at Lake Oroville are seen in an aerial photo Monday.
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A dump truck crosses the primary spillway to deliver boulders to the damaged emergency spillway at Lake Oroville on Monday evening.
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Helicopters place large rocks on the damaged emergency spillway at Lake Oroville on Monday evening.
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Around-the-clock monitoring continues on the damaged primary spillway at Lake Oroville on Monday evening.
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Water rushes down a spillway at the Oroville Dam. (Brian van der Brug / Los Angeles Times)
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California Department of Fish and Game wardens view the damaged spillway on Monday. (Brian van der Brug / Los Angeles Times)
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Bill O’Kelley, 86, and wife Doris O’Kelley, 84, of Oroville sit near a flagpole Monday at the Silver Dollar Fairgrounds evacuation center in Chico, Calif.
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Coua Tha, of Oroville prepares a meal for her family in the parking lot at the Silver Dollar Fairgrounds evacuation center in Chico, Calif.
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Desiree Garcia and daughter Kay’lee Pearl Garcia, 3, of Oroville look over donated clothing Monday at the Silver Dollar Fairgrounds evacuation center in Chico, Calif.
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Members of Oroville’s Jordan Crossing Mission pray with a volunteer service member Monday at the Silver Dollar Fairgrounds evacuation shelter in Chico, Calif.
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The swollen Feather River flows through Oroville, Calif., on Monday.
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A building is submerged in Riverbend Park as more water is released from Lake Oroville.
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Siblings Zach Soto, 11, left, and Gabby Soto, 13, keep an eye on the Feather River along a railroad bridge in Oroville, Calif., on Monday. The family decided to stay in Oroville as they live on high ground near downtown.
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Water flows down the damaged main spillway of the Oroville Dam at 55,000 cubic feet per second into the Feather River. (Brian van der Brug / Los Angeles Times)
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Water from Lake Oroville flows down the damaged main spillway.
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Water from Lake Oroville flows down the emergency spillway of the Oroville Dam toward the Feather River.
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Pacific Gas & Electric crews aided by a helicopter removed transmission lines and insulators from towers standing in the bed of the emergency spillway of Lake Oroville.
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A rainbow appears over Feather River as water cascades down the damaged spillway at Lake Oroville Dam.
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Water cascades down the spillway below Oroville Dam. The water is being released by authorities to avoid flooding at Lake Oroville because of recent heavy rain. (David Butow / For The Times)
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Pacific Gas and Electric Co. crews move two electric transmission line towers on the bank of Feather River as a precaution if the Lake Oroville Dam emergency spillway needs to be used.
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A California Highway Patrol cruiser patrols Lake Oroville Dam, which is closed to the public due to the damaged spillway.
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Water cascades down the spillway below the Oroville dam. The water is being released by authorities to ease flooding in Lake Oroville because of recent heavy rain.
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Butte Country Sheriff Kory L. Honea speaks with department of water and power workers at an overlook as the observe runoff from the Oroville Dam.
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Water trickles down as workers inspect part of the Lake Oroville spillway failure in Oroville, Calif.
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A boat launch at Bidwell Canyon is still hundreds of yards above the current lake level on Jan. 21, 2016.
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California State Park Ranger Bryan Taylor searches for signs of disturbance or theft as California’s severe drought conditions are revealing historic artifacts at Lake Oroville, June 21, 2014.
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Severe drought conditions are evident as a family treks across a long path back to their car at Lake Oroville, June 21, 2014.
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Houseboats are dwarfed by steep banks that show the water level down 160 feet from the high water mark at the Bidwell Bar Suspension Bridge over Lake Oroville on June 21, 2014.
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Houseboats at Bidwell Canyon Marina at Lake Oroville, January 21, 2016.
(Brian van der Brug / Los Angeles Times) The goal, authorities said after the immediate crisis was averted, is to lower the lake enough to handle an inflow of water from a series of storms expected to move in Wednesday night.
In a break for residents and water officials, the incoming storm system should be far weaker than the one that inundated Northern California last week.
In the five days from Feb. 6 to Friday, Oroville received more than 6 inches of rain, Rowe said. The surrounding mountains and foothills received up to 24 inches of rain and snow in the same time period, he said.
The storm’s runoff sent water into the Oroville reservoir at an average rate of 115,260 cubic feet per second, data show. The lake’s water level climbed 50 feet in five days.
The reservoir has handled heavier inflows before, according to the Water Resources Department. It normally compensates by increasing flow from the dam’s main spillway. But when the gaping hole opened in the spillway last week, the agency slowed the release of Oroville’s water to a trickle, boosting storage in the lake and eventually sending water over the weir and into the emergency spillway. To reduce the risk of further erosion of the emergency spillway, the flow in the main spillway was increased, despite its damaged state, to bring the lake level back down.
The storms that are due to begin arriving on Wednesday are far weaker, said meteorologist David Rowe of the National Weather Service’s Sacramento office. Only about 2 inches of rain should fall on Lake Oroville between late Wednesday and Feb. 21 and only about 8 inches of rain and snow are expected to drop in the surrounding watershed, he said.
“It’s still a lot but quite a bit less than last week,” Rowe said.
Oroville is California’s second largest reservoir and is impounded by the nation’s tallest dam.
joseph.serna@latimes.com
For breaking California news, follow @JosephSerna on Twitter.
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